//关闭等待窗口
function closediv()
 {
    //Close
 Div 
    document.body.removeChild(document.getElementById("bgDiv"));
    document.getElementById("msgDiv").removeChild(document.getElementById("msgTitle"));
    document.body.removeChild(document.getElementById("msgDiv"));
}
//显示等待窗口
function showdiv(str)
 {
    var msgw,
 msgh, bordercolor;
    msgw
 = 400; //提示窗口的宽度
    msgh
 = 100; //提示窗口的高度
    bordercolor
 = "#336699";
//提示窗口的边框颜色
    titlecolor
 = "#99CCFF";
//提示窗口的标题颜色
 
    var sWidth,
 sHeight;
    sWidth
 = window.screen.availWidth;
    sHeight
 = window.screen.availHeight;
 
    var bgObj
 = document.createElement("div");
    bgObj.setAttribute('id',
'bgDiv');
    bgObj.style.position
 = "absolute";
    bgObj.style.top
 = "0";
    bgObj.style.background
 = "#777";
    bgObj.style.filter
 = "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
    bgObj.style.opacity
 = "0.6";
    bgObj.style.left
 = "0";
    bgObj.style.width
 = sWidth + "px";
    bgObj.style.height
 = sHeight + "px";
    document.body.appendChild(bgObj);
    var msgObj
 = document.createElement("div")
    msgObj.setAttribute("id",
"msgDiv");
    msgObj.setAttribute("align",
"center");
    msgObj.style.position
 = "absolute";
    msgObj.style.background
 = "white";
    msgObj.style.font
 = "12px/1.6em
 Verdana, Geneva, Arial, Helvetica, sans-serif";
    msgObj.style.border
 = "1px
 solid " +
 bordercolor;
    msgObj.style.width
 = msgw + "px";
    msgObj.style.height
 = msgh + "px";
    msgObj.style.top
 = (document.documentElement.scrollTop + (sHeight - msgh) / 2) + "px";
    msgObj.style.left
 = (sWidth - msgw) / 2 + "px";
    var title
 = document.createElement("h4");
    title.setAttribute("id",
"msgTitle");
    title.setAttribute("align",
"right");
    title.style.margin
 = "0";
    title.style.padding
 = "3px";
    title.style.background
 = bordercolor;
    title.style.filter
 = "progid:DXImageTransform.Microsoft.Alpha(startX=20,
 startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
    title.style.opacity
 = "0.75";
    title.style.border
 = "1px
 solid " +
 bordercolor;
    title.style.height
 = "18px";
    title.style.font
 = "12px
 Verdana, Geneva, Arial, Helvetica, sans-serif";
    title.style.color
 = "white";
    //title.style.cursor
 = "pointer";
    //title.innerHTML
 = "关闭";
    //title.onclick
 = closediv;
    document.body.appendChild(msgObj);
    document.getElementById("msgDiv").appendChild(title);
    var txt
 = document.createElement("p");
    txt.style.margin
 = "1em
 0"
    txt.setAttribute("id",
"msgTxt");
    txt.innerHTML
 = str;
    document.getElementById("msgDiv").appendChild(txt);
}
//屏蔽F5
document.onkeydown
 = mykeydown;
function mykeydown()
 {
    if (event.keyCode
 == 116) //屏蔽F5刷新键  
    {
        window.event.keyCode
 = 0;
        return false;
    }
} 